Clamp fob bonding brake linings to



y 1950 J. v. HENDRICK 2,513,800

CLAMP FOR BONDING BRAKE LININGS TO BRAKE SHOES Filed Jan. 27, 1948 INILENTOR.

JOHN V. HENDRIGK.

Patented July 4, H50 .5.:

' CLAMP Fon BONDING BRAKE BRAKE SHOES I TnGs T0 John Hendrick, Highland Park, Mich., assignor to Chrysler Corporation, Highland Park, Mich., a corporation of Delaware Application January 27, 1948, Serial No. 4,521

2 Claims. (01. 154-1) This invention relates to a clamp and more:

particularly to a clamp for applying pressure to a brake lining and a brake shoe while effecting a surface bond therebetween.

The attachment of a brake lining to a brake shoe by a film or layer of adhesive between adjacent surfaces thereof necessitates pressing these parts together with a force sufficient to establish and maintain the surfaces in intimate conface bonding. In carrying out the foregoing,

the clamp includes means forstoring pressure applying force which takes up and maintains the requisite pressure in response to any otherwise diminution of pressuredue to the clamp reacting to the temperature employed to set the adhesive and shrinkage of the latter during setting. i

More specifically, an object of the invention is the provision of a, clamp including a spring through which pressure is applied to the'brake lining and the brake shoe, and which is loaded as an incident to pressure application and provides in effect a follow up pressure to compensate for any relaxation of normal pressure during the time the clamp and shoe assembly are subjected to the necessary temperature for setting of the adhesive.

1 Another object of the invention is the provision of a clamp which can be securely attached at one end thereof to an end of the shoe and lining assembly and wrapped thereabout by the exertion of a pulling force at the other end of the clamp and the shoe and lining assemblytopress the lining and shoe together.

It is important in bonding lining to a shoe to form a good bond at the terminal ends of the lining and a further object of the invention is the provision of a clamp which will exert the necessary pressure at the shoe ends during setting of the adhesive.

A further object of the invention is the provision of a clamp as aforesaid for use in connection an arcuate rim 6 and a web 1.

with shoe and lining assemblies of relatively different radii.

Other objects and advantages of the invention will be more apparent from the following description taken in connection with the accompanying drawings, in which: I

Fig. 1 is a plan view showing the clamp in pressure applying assembly with a brake shoe and a brake lining.

Fig 2 is an exploded view in plan showingthe clamp, lining, and brake shoe of Fig. 1 disas sembled. Fig. 3 is a fragmentary elevational view taken as indicated by the line 33 of Fig. 1.

Fig. 4 is a view partly in section taken as indicated by the line 4-4 of Fig; 2.

In the drawings, the numeral 5 designates a brake shoe typical of those employed in the wheel brake for a motor vehicle, the shoe having The heelend of the shoe has an opening 8 in the web adapted to receive a pin for mounting the shoe relative to its support (not shown) and when thus mounted the shoe will be forced into braking engagement with the cooperating wheel drum by a force applied at the other or toe end of the shoe. Each shoe carries a lining segment 9 of well known material having suitable friction characteristics for effecting the maximum braking force when the lining is urged against the wheel brake drum.-

and thus extend the useful life of the lining and avoid the possibility of metallic contact between the rivets and brake drum due to wear of the lining. Any suitable adhesive may be used to" bond the lining to the shoe, and such adhesive may be applied to a surface of the lining or the shoe rimor both, although it has been determined that the requisite bond can be had by applying a'fllm or layer of thermosetting'adhesive'or cement to the inner surface of the lining. The shoe and lining are then pressed together to secure intimate contact between the adjacent surfaces thereof with the adhesive therebetween during the setting or curing of the adhesive or cement. Certain thermosetting adhesives or cements, usable for this purpose, may be set or cured by exposing the same to a temperature of 325 F. for a period of fifteen minutes. A very thin film of this adhesive or cement will suflice and the same is illustrated at l0, applied to the inner surface of the lining 9, as shown in Fig. 2,.

The clamp includes a relatively flexible arcuate strap ll, preferably metallic, which engages the outer surface of the lining 9 and has an arcuate contour. That end of the strap which is to be engaged with the shoe at the toe end thereof, as shown in Fig. 1, is reversely bent with a spacer t2 between the folds and a*p1ate';l3'and a plate l4 are riVeted'or bolted as at- 15 to the:

band and spacer [2. A wedge-shaped space is provided between the strap H and plate l3 at one side and the plate M at the other side, and

the shoe and lining extend into the space; the

end of the strap at spacer l2 extending beyond the adjacent ends of the shoe: and lining, as shown in Fig. 1. In order to fix the strap" I! at? this end of the shoe, the plate I4 has a slot I6 which receives the shoe web 7, the terminal edge of the latter engaging the end wall of slot lGto resist a pulling force to be applied to the other end of' slot 21 and registering with the opening 8 in the web to receive a. pin 23- which connects'the member I il with the shoe 5. v

The rod l1" extends beyond the ear l9 and through a coil spring; 24-,-one end-of the latter abutting the ear. A wind nut 25 is threaded onto the end portion 1 ofthe rodwhich projects beyond the spring ilk-a washer ZSbeinginterposed between th'e nut and adjacent end of the coil spring.

A sleeve 21 surrounds the spring 24 and is positioned between the ear I9 and washer 26.- At the initial pull exerted on the strap I by threading of the nut 25 onto the rod, the sleeve 2 1 hasaxial" clearance between the washer 26 and'ear l9 and-when the requisite pressure has been applied to the lining and shoe this clearance is taken up, as indicated in Fig. 1. is calibrated to cause the strap H to produce a predetermined pressure against the lining when thespring has been so compressed as to take up against the lining as aforesaid will be resisted by the engagement of the web edge 28 with the e'ndwall 29 of the slot 2|.

The assembly as shown in Fig. 1 is subjected The spring 26 .4 to a temperature, as by placing in a heated oven, sufficiently high to set the adhesive and should the latter shrink during setting, the loaded spring will function to take up any release of pressure incident to such shrinkage or heat reaction which the strap may undergo.

"Ihe'-'"stra;p "l land rod: lrrare of such length thatthe clam p may be -used in connection with shoes having relatively different radii.

I claim:

1. A clampior use in securing a brake lining segment to a brake shoe having an arcuate rim, comprising a strap adapted to be attached at oriieridtherihf to: amend of said shoe and to be drawn: against the lining segment to press the s'arzheagaihst the" shoe rim, an anchor member shoe and having an opening therethrough, a

' threadetl element secured to the other end of the strap and extending through the opening in the anchor member, a nut threadable' onto said threaded element, a spring:mbunted betweensaid anc'hor'member and said nut" adapted to beload ed by the threadingofl saidinutwohto' -sa'id thread ed element, saidii spring being 'so' calibrated. as t0-transmit a predeterrninedipr'essure'tb said lin ing segmentthroug h saidi band. inresponse to predetermined loading: of said spring, and means positioned:betweemsaidi anchor member a-nd' saidnu-t and? en'gageable withsaid-anchor member op posing the threading iofsaith-nut onto'said threaded! element when said. spring: has been placed under said predetermined load'.

2. A" clampfor use in securing a brake linihg segmenht'o a brake" shoe having anarcuate rim, comprising aistrap' 'adapted tb "be" attached 1 at one en'd'thereofsto ari endtof said sh'oeand-to-be drawn against thesulining segment: to press the" same againstjthe shoe'rimg an' anchor member detach-- ably engageable withi'the other ehdof th'shoe" and'hav'in'gt an openingetherethrough, a threaded element secur'edsto theiother end of the strap and-1 extending; througl'rv the opening; in the an chormember, a nut threa'dab'le onto :said thread edelement; a"- spring :m-ouhtedl betweeri said' a-nchormember, and said nutadapted to' be loaded by 'thethreading of" said nutonto saidthre'adedelement, said spring being, socalibrated asto transmit a predetermined pressure to saidlining segment; through said-band in response to predeterminedloadingof said spring, and a sleeve surrounding said spring and said threaded elemer t anddisposed between said nut and said anchor. member limiting threading of said nut onto said threaded element When-said spring has been placedunder said: predetermined load.

JOHN V.- I-IENDRICK.

RhF'riREN'oEs CITED The following: reijerences are of record in the file of this patent":

- UNITED STATES PATENTS Number Name Date 13600572 'J-anowski Sept. 21, 1926 1,903,058 .McNaug hti Mar. 28,1933 

